A369424 Expansion of Sum_{n>=1} x^(n^2)*((1+x)/(1-x))^n.

1, 2, 2, 3, 6, 10, 14, 18, 23, 32, 48, 72, 104, 144, 192, 249, 320, 416, 552, 744, 1008, 1360, 1816, 2392, 3105, 3978, 5050, 6386, 8082, 10266, 13098, 16770, 21506, 27562, 35226, 44819, 56702, 71298, 89134, 110898, 137502, 170146, 210382, 260178, 321982, 398786, 494190, 612466, 758623, 938480, 1158768

Offset: 1

Author

Joerg Arndt, Jan 23 2024

Keywords

• nonn
• easy

Crossrefs

Cf. A369425.

Programs

PARI

my(N=66,x='x+O('x^N)); Vec(sum(n=1,N,x^(n^2)*((1+x)/(1-x))^n))